Grinding apparatus.



L. KOFFMAHNE. GRINDING APPARATUS. APPLICATION FILEDIAPR. 30. I914.

Patented May 30,1916.

LUDWIG xorz'rmnns, ormtm-cnnnmrrnnnons; cam/mica, assienoa To sm-MENS-SCHUCICERTWEB'KE G. M. B. H., A CORPORATION OF GEBIANY.

F sIEMIiNss'rA'p'r, NEAR BERLIN, GEBMANY,'

snmnmc' APPARATUS.

Specification of Letters Patent.

Patented May 30. 1916.

Application filed April 30, 1914. Serial N0. 835,516.

' T 0 all whom it may concern I (emplet during motion ofisaid'pin Be itknown that I, Lnnw c Korrxanxn, a German citizen, and resident ofBerlin- Charlottenburg, Germany, have invented certain new and usefulImprovements in Grihding Apparatus, of which is a specification. sinvention more particularly relates to animprovement of the ordinarydevices for smooth grinding of the curvilinear faces of profiled grinderdisks, which serve for the finishing by the milling process and thesubsequent hardening. In devices of this kind the working tools, whichare preferably provided with diamond points, are mounted to rmit theirpoints' tooscillate to and fro cithfr'in a straight or in a curved line.The points of the working tools are'further swung by a simultaneouschange of the pivot distance bya templetwhich slides upon a guidingmember, thus vilinear motion of the points of the dd ktools along thefacesof the grinding 1s l This invention relates more specifically to aconstruction whereby the templet is immediately fixed to the .fulcru'mpin or also to the diamond holder without the-insertion of.intermediatemovable p lrts,. said being carried alon a fixed guiding that aswinging of the working tools takes place in the intended curved of theface of the tooth. Obviously also the templet may be arrang'ed fixed inY may be connected 'with the rotating I of the working ls,and slideuponthlefi templet by posit ely swinging with said; working tools.

y the new arrangement according to this invention I attain anessentiallymore accurate working than that which is possible by theordinary devices of this kind, since by my invention the disadvantage isobviated that the touch between the stop and the templet and theswinging of the working tools due to theidle motion of the intermediatemember-are displaced in time against each other. If however the timedisplacement between said touch andsaid swinging the distortion of v thegrindmotion is done away with curvedescribed by the point'of the, ingtool will be obviated, and the onethe foll'owing I ,of the teeth of cogwheels after their formation Y =vent1on, and of which F1 1 may be refholder. itself carries determining the can member, so :1

a space and the diately eviden 'the'sprmg s comp becomes the exactmirror image of the other.

hance ploym'ent' of very large templets which in :a construction inaccordance to this invention may easily be ven a ver eat ratio oftransmission bet v veen the iioikng and the guiding side of the swingingtool holders.

My invention will be more fully understood by reference to the aceompan'ing drawing, of which Figure 1 shows an e evation of a devic-accordin Ig. 2 is a plan view taken on F i 1, bat with the work removed. Fig. 3 isa etail view.

he constructionshown in the drawing garded as an example of carryingnvention into effect, in

the templet, so that at the bench of the machine only a fixed stop needsto'be provided, along which the templet may slide;

In the dra va deslgn' ates the grinding tools, 6 the toolholders and ithe grinder be worked upon. The toolrotatably mounted at c in arms diskwhich shall holders 6 are which the t00l.

to my present ind which swing around the fulcrum pins e. Thearms d andthe tool-holders b with the templets f are pressed in any desired manneragainst the rollers g, the means of exerting such a pressure beingindicated by the spring a in the drawing, which spring tends to approachthe lower ends oi the arms d to each other. The rollers g are mountedat. a fixed point. relativeiy to the working bench' If now the templetsf, and therewith simultaneously the' tool-holdera 1) are rotated, thetool points are carried in a curve corresponding to the desired form ofthe faces I; of fl e'jtooth. It is now immetransmissionfi-ntio, the

by choosing a;

do as accurate as dep rati this arrangement,-

ired at the'douiile'' armed tool-holder.. The.

that; it may drawing this templet of course ismade, 'so easily beexchanged. In the templet is shown as a-aegment which is kept inposition upon a disk 'n by means of the r .-s m, the disks beingintegral or rigidly joined with the'arms I. The means for periodically Irise shafts-79 upon which oscillating the arms d against the arms d arerigidly mounted. Shafts p v are jeurnaied in the bed on the work benchThe shafts 7 may be automatically oscillated by connecting them throughsuit able mechanisms with the drive shaft of the machine, but preferablythis is done by hend means being shown in Figs. and The shafts carrycams t on which are mounted pins 11-. The links 2 and .2 are pivotallyconnected with pins u zit one end i and at their other ends are joinedtogether and with the lever 2? by the pivot 3 While I have-shown in thedrawing a. construction, in which'the tool-holders are mounted to exert:1 swinging motion, it is of course understood that this motion may aswell be a sliding motion. T i

1 claim as new and desire to secure by;

Letters Patentof the Unitecl .St-ates:--

'1; An apparatus of the character described, comprising a pair ofpointed grinding tools," tuol holders thereforgf'said tool holders,being mounted to permit vcurvi-- linear motion ofthe. points ofsaidtools,

pressure means applied to said tool holders tending to more the pointsof said tools i. away from-each other, segmental templets nwunteddirectly upon said tool-holders,'-

and stops for said teniplets oo'unterncting said pressure neans, wherebythe. points of said grinding'tb'ols ivillbe enabled to move' accordingto the curve prescribed by the;

form of said teinplets. v

An apparatus of the character d'escribed, comprising a pair of pointedgrm'ding tools, a double-armed lever mechanism for mounting grindingtools to permit mdtlon of the po nts thereof according to a desiredcur\-e', pressure means n'pplied to said lever mechanism, 'fstop's'adapted to guide templets carried by-seid lever mecha- 40 nisin, saidstops counteracting said pressure ineans'by' the Contact with saidtemplets,

whereby thepoints of said grinding tools Wlll be permitted to move in acurve which is positively prescribed by the form of said 45 templets. Anapparatus of tl1Cl1 iiI11CiZ6l" desc1'ibed,-comprising a pair of pointedgrind-- ing tools mounted yvith their points opposite.

air of double lever meclm- 50' to each other, nisms respective-carry1ng.-sa1d grinding tools and.permittingcurvilinear motion oil J"the points of said tools in a plane, pressure means iipplied to saiddduble lever mechanism, segmental templetsu "exchangeablys -moun ted'd-irdctliy onsaid-mechanism; and V i 'guiding members for'said-rtempletgi. said guiding members being; iidaZptedf-to countera'ctsaid pressure means, whereby the points of said grinding toolswillbepermibted'to i 7 move along-acu-rve which is pos'itively pre-

